A method for monitoring an energy supply in a motor vehicle. At least one energy reservoir supplies energy to several preferably safety-relevant loads in a partial vehicle electrical system. At least one measured variable of an energy reservoir and/or of at least one load is detected. At least one wiring harness model is provided which models the partial vehicle electrical system. A parameter estimator is provided which assesses at least one characterizing variable of the wiring harness model using the measured variable.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The method as recited in claim 1, wherein the loads are safety-relevant loads.
3. The method as recited in claim 1, wherein the characterizing variable of the wiring harness model is used to generate an error information item.
4. The method as recited in claim 3, wherein the characterizing variable of the wiring harness model is used to generate the error information model at least one of: (i) upon deviation of the characterizing variable from a limit value, or (ii) upon deviation of further characterizing variables which are determined depending on the characterizing variable of the wiring harness model, from a limit value.
6. The method as recited in claim 1, wherein the parameter estimator includes at least one at least one predictor or at least one corrector.
8. The method as recited in claim 1, wherein at least one load distributor is provided in the partial vehicle electrical system, the load distributor being supplied with energy by the energy reservoir, the load distributor supplying energy to several loads necessary for an autonomous driving mode, the measured variable being detected at the load distributor, and being delivered to the parameter estimator to ascertain the characterizing variable.
9. The method as recited in claim 1, wherein at least one separating element is provided in the partial vehicle electrical system, the measured variable being detected at the separating element and being delivered to the parameter estimator to ascertain the characterizing variable.
10. The method as recited in claim 9, wherein the separating element is a DC voltage converter.
13. The method as recited in claim 1, wherein a positive-side contact resistance and a ground-side contact resistance are assessed in total as the characterizing variable of the wiring harness model.
15. The method as recited in claim 14, wherein the filter is a fractional delay filter, or a Lagrange filter, or a Farrow filter.
16. The method as recited in claim 14, wherein for time synchronization of the measured variables, the filter determines a delay factor for all of the measured variables that are to be delayed.
17. The method as recited in claim 16, wherein the delay factor of the filter is determined by a second parameter estimator.
19. The method as recited in claim 18, wherein the state estimator is a Kalman filter, or an extended Kalman filter, or an unscented Kalman filter, or a recursive least-squares or particle filter.
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June 22, 2019
June 25, 2024
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